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Juan Cuadrado – £26.8m to Juventus

Cuadrado never really settled in London and ultimately joined Juventus after two loan spells in Turin. He may have been given a chance under Antonio Conte had he stayed but Victor Moses has excelled on the right flank instead.

Christian Atsu – £6.2m to Newcastle

Chelsea signed Atsu from Porto in 2013, sent him on five loans then shipped him out without a single appearance to his name.

Reuters

Christian Atsu made his Newcastle loan permanent

Bertrand Traore – £17.5m to Lyon

The pacey forward, 21, joined Chelsea’s academy in 2013 but despite 16 first-team appearances and four goals in the 2015-16 campaign he will have to rebuild in France.

Oscar – £60m to Shanghai SIPG

The Brazilian was a useful option off the bench but a ridiculous £60m offer was never going to be turned down.

AP:Associated Press

Oscar chose to move to the Chinese Super League

Patrick Bamford – £6m to Middlesbrough

England Under-21s striker Bamford was never given a chance at Chelsea and moved to Boro in January. He left with no appearances for the Blues but did manage six loan spells.

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Patrick Bamford has more loans than games like a few others in this list

Stipe Perica – £3.4m to Udinese

The Croat, 21, had about as unremarkable career at Chelsea as you can imagine after signing from Zadar in his homeland in 2013. He never played for the club and left three years later.

Mohamed Salah – £11m to Roma

Salah is back in England with Liverpool after rebuilding his career with Roma. He managed just 19 appearances in two seasons with Chelsea, who may regret not giving him a shot.

Papy Djilobodji – £8m to Sunderland

The only thing stranger than Chelsea’s shock swoop for the centre-back was Sunderland’s decision to splash out for him.

Marko Marin – £3m to Olympiakos

Marin played 16 times – largely in cups – after signing in 2012 but after failing to impress was shipped out on loan before being flogged.

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Marko Marin did not settle in West London

Ramires – £25m to Jiangsu Suning

Chelsea have milked the Chinese Super League cash cow more than most and had no issue letting the Brazil midfielder leave in 2016.

PA:Press Association

Ramires opted to move to China, where he has thrived

Thorgan Hazard – £5.85m to Borussia Moenchengladbach

Eden’s younger brother joined him in London but after just one appearance in the reserves was loaned to Zulte Waregem. He joined Monchengladbach permanently in 2015 after impressing on a short-term deal.

Gael Kakuta – £2.5m to Sevilla

Kakuta came through Chelsea’s youth ranks but never really came close to making the step up. He moved to Sevilla in 2015 before moving to Hebei China Fortune a year later.

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Gael Kakuta also ended up in China – via Spain

Petr Cech – £10m to Arsenal

Cech was ousted upon Thibaut Courtois’ return and out of respect for his loyalty allowed to join rivals Arsenal. He continued his winning streak after lifting the FA Cup for the fifth time in May – the first with Arsenal.

Josh McEachran – £750,000 to Brentford

Many though McEachran was destined for the very top but in a familiar story could not get the run of games he needed to reach his potential.

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Josh McEachran was once regarded as a future star

Felipe Luis – £17m to Atletico Madrid

The left-back saw Cesar Azpilicueta switch flanks to take his place and ended up back at Atletico Madrid a year after leaving them for Chelsea – netting the Blues a small profit.

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Felipe Luis returned to Atletico Madrid after just one season

Oriol Romeu – £5m to Southampton

Barcelona academy graduate Romeu spent four seasons at Chelsea – playing 33 times – before joining Southampton in 2015.

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Oriol Romeu was given a second chance by Southampton

Andre Schurrle – £22m to Wolfsburg

Schurrle looked like he was developing into a fine player at times but lacked the consistency to nail down a spot. He moved to Wolfsburg two years after joining Chelsea and has since joined Dortmund.

Times Newspapers Ltd

Andre Schurrle showed glimpses of quality

Ryan Bertrand – £10m to Southampton

Now regarded as one of the best left-backs in England, Bertrand is another who got away. The academy star played just 28 league matches from 2006-2015 while racking up nine loan moves before joining the Saints.

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Ryan Bertran has improved considerably since quitting the Blues

David Luiz – £50m to Paris Saint-Germain

The Brazilian is thriving in his second spell at Stamford Bridge but was considered expendable when PSG came calling in 2014 with John Terry still in his prime.

Demba Ba – £4.7m to Besiktas

Big things were expected from Ba when he signed from Newcastle in 2013. But he failed to recreate his form and was in Turkey a year later.

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Demba Ba failed to carry his form over from Newcastle

Patrick van Aanholt – £1.5m to Sunderland

The Dutchman was another to be loaned out repeatedly after coming through the academy. He hit form after signing for Sunderland in 2014 and earned a Crystal Palace switch last season.

Romelu Lukaku – £28m to Everton

Chelsea cashed in on the former Anderlecht striker in 2014 and will regret the decision. The powerhouse could set them back £70m if they want him back.

George Saville – £1m to Wolves

Saville joined Wolves in 2014 having never played for the Blues – brother Jack also came through the youth ranks and is now with St Albans City.

Juan Mata – £37.1m to Manchester United

Mata did not fit in with Jose Mourinho’s style and was allowed to join United in a big-money move. The Spaniard is now thriving under the Special One.

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Juan Mata was sold by Jose Mourinho as he did not fit the Blues style

Kevin De Bruyne – £16.5m to Wolfsburg

Another blunder. The Belgian is proving his quality at Manchester City after leaving the Blues in search of first-team football.

Keep up to date with all the latest news, gossip, rumours and done deals in SunSport’s live transfer blog